From: Kent Overstreet <kmo@daterainc.com>
Date: Thu, 25 Jul 2013 00:20:19 +0000 (-0700)
Subject: bcache: Explicitly track btree node's parent
X-Git-Tag: v3.13-rc1~68^2~1^2~45
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d6fd3b11cea82346837957feab25b0be48aa424c;p=pandora-kernel.git

bcache: Explicitly track btree node's parent

This is prep work for the reworked btree insertion code.

The way we set b->parent is ugly and hacky... the problem is, when
btree_split() or garbage collection splits or rewrites a btree node, the
parent changes for all its (potentially already cached) children.

I may change this later and add some code to look through the btree node
cache and find all our cached child nodes and change the parent pointer
then...

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
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